The fastening points should always be in line with the diagonals of the shade sail (medians for triangles):
Allow a minimum margin of 45 cm in these diagonals for the fasteners to exert sufficient tension.
The sides of the shade sails are curved. This ensures that the sail is properly tensioned without wrinkles.
The size of the shade sail under tension can vary up to +/- 5% from the given size, due to the elasticity of the fabric, the manufacturing processes and the tension put on the sail.